ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/sound/hda/controllers/Kconfig b/sound/hda/controllers/Kconfig
new file mode 100644
index 000000000..26ca69b09
--- /dev/null
+++ b/sound/hda/controllers/Kconfig
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config SND_HDA_INTEL
+	tristate "HD Audio PCI"
+	depends on PCI
+	select SND_HDA
+	select SND_INTEL_DSP_CONFIG
+	help
+	  Say Y here to include support for Intel "High Definition
+	  Audio" (Azalia) and its compatible devices.
+
+	  This option enables the HD-audio controller.  Don't forget
+	  to choose the appropriate HD-audio codec options.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-hda-intel.
+
+config SND_HDA_TEGRA
+	tristate "NVIDIA Tegra HD Audio"
+	depends on ARCH_TEGRA
+	select SND_HDA
+	select SND_HDA_ALIGNED_MMIO
+	help
+	  Say Y here to support the HDA controller present in NVIDIA
+	  Tegra SoCs
+
+	  This options enables support for the HD Audio controller
+	  present in some NVIDIA Tegra SoCs, used to communicate audio
+	  to the HDMI output.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-hda-tegra.
+
+config SND_HDA_CIX_IPBLOQ
+	tristate "CIX IPBLOQ HD Audio"
+	depends on ARCH_CIX || COMPILE_TEST
+	depends on ARCH_DMA_ADDR_T_64BIT
+	select SND_HDA
+	select SND_HDA_ALIGNED_MMIO
+	help
+	  Say Y here to support the HDA controller present in CIX SoCs
+
+	  This options enables support for the HD Audio controller
+	  present in some CIX SoCs.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-hda-cix-ipbloq.
+
+config SND_HDA_ACPI
+	tristate "HD Audio ACPI"
+	depends on ACPI
+	select SND_HDA
+	help
+	  Say Y here to include support for Azalia-compatible HDA controllers
+	  which are advertised via ACPI objects.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-hda-acpi.